"It's hateful when a developer takes a 'shortcut' that saves that individual a couple of minutes, but thereafter causes extra effort from every single user. Awful as they are, these application design errors - all the fault of lazy developers - are entirely too common."

I like these usability articles too. Usability mistakes are so annoying at times. The worst usability mistake I have found so far is when you take 5 minutes to fill out a registration form, you submit it, get an error message saying that field #17 is mandatory and...You're redirected to a blank form again!!! Yeah!!!